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Building cost estimates for every Northern Ireland postcode
Every BT postcode is priced. Belfast and the Greater Belfast ring carry a slightly higher rate than the rest of Northern Ireland, because labour and access cost more in and around the city. Everywhere else uses the wider Northern Ireland rate.
BT1 – BT17
Belfast city and its immediate suburbs, including Dundonald and Dunmurry
BT18 – BT29
Holywood, Bangor, Donaghadee, Newtownards, Ballynahinch, Hillsborough, Lisburn and the commuter belt
BT30 – BT35
Downpatrick, Castlewellan, Banbridge, Newcastle and Newry
BT36 – BT44
Newtownabbey, Carrickfergus, Ballyclare, Larne, Antrim and Ballymena
BT45 – BT49
Magherafelt, Maghera, Derry / Londonderry and Limavady
BT51 – BT57
Coleraine, Ballymoney, Ballycastle, Portstewart, Portrush and the north coast
BT60 – BT71
Armagh, Portadown, Craigavon, Lurgan, Moira, Dungannon and Coalisland
BT74 – BT82
Enniskillen, Fivemiletown, Omagh, Cookstown, Castlederg and Strabane
BT92 – BT94
Lisnaskea, Kesh and Ballinamallard in County Fermanagh
Towns and cities
We price building work in all of these, and everywhere between them.
Belfast Lisburn Bangor Newtownabbey Castlereagh Holywood Newtownards Carrickfergus Antrim Ballymena Craigavon Armagh Newry Downpatrick Derry / Londonderry Omagh Enniskillen Coleraine
Start with a calculator
Extension
Free house extension cost calculator for Belfast and Northern Ireland. Instant estimate with a full cost breakdown, fees and contingency. Updated for 2026.
Loft conversion
Free loft conversion cost calculator for Belfast and Northern Ireland. Rooflight, dormer, hip-to-gable and mansard prices with fees and contingency.
Loft Insulation
Free loft insulation calculator for Belfast and Northern Ireland. Rolls to order, installed cost, U-value before and after, and a realistic annual saving.
Wall insulation
Free wall insulation calculator for Belfast and Northern Ireland. Compare cavity, external and internal insulation costs, U-values and realistic savings.
Bricks
Work out how many bricks you need for any wall, plus packs, sand and cement, with 2026 Northern Ireland brick and bricklaying prices and full workings.
Concrete
Work out how much concrete you need for a slab, footing or post holes, with cement, sand and aggregate quantities and 2026 Northern Ireland prices.